ok, delivered in 36 days.
Ordered on Aug. 14, delivered on Aug. 28. Very fast delivery. All good. But the holes in PCB are not exactly matching pins in 2 older Makita BL1830 batteries I have. I solved it by removing those pins, which is not ideal, but works. After installation battery changes again. For long time I suspect it may drain first battery pair. There is no balancing and the circuit is not measuring voltage of batteries. The circuit should be used with a caution in my opinion, but works and can be used.